Accession Number : ADA295787

Title :   Design, Evaluation, and Construction of Texess and Luxess, and Research in Mini-Array Technology and use of Data from Single Stations and Sparse Networks. Phase 3,

Corporate Author : SOUTHERN METHODIST UNIV DALLAS TX

Personal Author(s) : Herrin, Eugene ; Golden, Paul ; Robertson, Herbert

PDF Url : ADA295787

Report Date : OCT 1994

Pagination or Media Count : 54

Abstract : Objectives are : (1) conduct research in seismic mini-array technology and single stations and sparse networks data, (CLIN 1) and (2) design, evaluate, and construct TEXESS, in Southwest Texas, and LUXESS, northeast of Luxor, Egypt, (CLIN 2), along the lines of a GSE Alpha Station. TEXESS was installed by SMU personnel in August 1993, and the first event was a local recorded on 31 August. With deinstallation on hold awaiting diplomatic agreements, work has been directed to CLIN 1 research. Research on time-domain processing of array data has resulted in a significant decrease in the standard deviation of azimuths as compared with f-k processing. For example, a reduction of azimuthal standard deviations from + or - 15 degrees with f-k processing to + or - 1.4 degrees with time-domain processing. The Ms:mb method is an effective and transportable discriminant for shallow events at teleseismic distances with mb greater than 4.75. SMU has been successful in reducing the detection threshold for fundamental mode Rayleigh waves using signals at regional distances for body wave magnitudes as low as 3. Autoregressive (AR) modeling on Lg data has resulted in the ability to discriminate small economic explosions from small earthquakes. (MM)

Descriptors :   *SEISMIC WAVES, *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, *EARTHQUAKES, *SEISMIC ARRAYS, *SEISMOLOGICAL STATIONS, COMPUTER PROGRAMS, NUCLEAR EXPLOSIONS, EGYPT, THRESHOLD EFFECTS, COMPUTER ARCHITECTURE, SEISMIC DETECTION, SEISMIC DATA, GLOBAL POSITIONING SYSTEM, DESIGN CRITERIA, AZIMUTH, TIME DOMAIN, STANDARD DEVIATION, TEXAS, BACKGROUND NOISE, RAYLEIGH WAVES, SHALLOW DEPTH.

Subject Categories : Seismology
      Seismic Detection and Detectors
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE